Only in that they both end with "oz" and sound nothing alike, don't share any common meaning, and have no other obvious connection. Personally, I don't see how anybody could ever confuse those two words.
Don't forget, trademark law is such that you have to protect your trademark or you lose it. If there's any risk at all of infringement, you have to go after it.
"any" risk? OK, great, there is a slight, however improbable, risk that somebody could confuse "Fogbeam" and "Moz". After all, we both do something related to computers and both words do contain an "o". So maybe Moz should attack us next?